How to fix the Oracle error TNS-01167: The command string is not supported by the listener contacted?

In this post, you’ll learn more about the Oracle ErrorTNS-01167: The command string is not supported by the listener contacted with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

TNS-01167: The command string is not supported by the listener contacted

Reason for the Error TNS-01167: The command string is not supported by the listener contacted

Cause: The listener does not recognize the command.

How to fix the Error TNS-01167: The command string is not supported by the listener contacted ?

You can fix this error in Oracle by following the below steps

Action: This is caused when a newer version of LSNRCTL contacts an old listener. Upgrade listener if executing this command is important.

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